| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Improving the spectral purity of single photons by a single-interferometer-coupled microring |
| Yang Wang(王洋), Pingyu Zhu(朱枰谕), Shichuan Xue(薛诗川), Yingwen Liu(刘英文),Junjie Wu(吴俊杰), Xuejun Yang(杨学军), and Ping Xu(徐平)† |
| Institute for Quantum Information&State Key Laboratory of High Performance Computing, College of Computer Science and Technology, National University of Defense Technology, Changsha 410073, China |
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Abstract We experimentally engineer a high-spectral-purity single-photon source using a single-interferometer-coupled silicon microring. By the reconfiguration of the interferometer, different coupling conditions can be obtained, corresponding to different quality factors for the pump and signal/idler. The ratio between the quality factor of the pump and signal/idler ranges from 0.29 to 2.57. By constructing the signal—idler joint spectral intensity, we intuitively demonstrate the spectral correlation of the signal and idler. As the ratio between the quality factor of the pump and signal/idler increases, the spectral correlation of the signal and idler decreases, i.e., the spectral purity of the signal/idler photons increases. Furthermore, time-integrated second-order correlation of the signal photons is measured, giving a value up to 94.95±3.46%. Such high-spectral-purity photons will improve the visibility of quantum interference and facilitate the development of on-chip quantum information processing.
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Received: 22 September 2021
Revised: 01 November 2021
Accepted manuscript online: 04 November 2021
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PACS:
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42.82.-m
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(Integrated optics)
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42.82.Et
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(Waveguides, couplers, and arrays)
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42.65.-k
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(Nonlinear optics)
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42.65.Wi
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(Nonlinear waveguides)
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| Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2019YFA0308700 and 2017YFA0303700) and the Open Funds from the State Key Laboratory of High Performance Computing of China (HPCL, National University of Defense Technology). |
Corresponding Authors:
Ping Xu
E-mail: pingxu520@nju.edu.cn
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Cite this article:
Yang Wang(王洋), Pingyu Zhu(朱枰谕), Shichuan Xue(薛诗川), Yingwen Liu(刘英文), Junjie Wu(吴俊杰), Xuejun Yang(杨学军), and Ping Xu(徐平) Improving the spectral purity of single photons by a single-interferometer-coupled microring 2022 Chin. Phys. B 31 034210
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